What Are The Difference Between Primary Key And Unique Key?

1.	What Are The Difference Between Primary Key And Unique Key?
Answer» An unique KEY CANT not be REFERENCED as FOREIGN key. And it may allow on NULL. An unique key cant not be referenced as foreign key. And it may allow on null.

Answer»

An unique KEY CANT not be REFERENCED as FOREIGN key. And it may allow on NULL.

An unique key cant not be referenced as foreign key. And it may allow on null.

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